首先,您必须检查此函数返回的记录,并检查dwLocalPortor dwRemotePort(取决于您需要检查的端口),然后您可以获取应用程序的pid检查dwOwningPid字段并使用Windows api函数解析exe名称像GetModuleFileNameEx

检查此示例应用程序,它显示所有tcp连接,如netstat.您可以修改此示例以符合您的要求.

uses
      PsAPI,WinSock,Windows,SysUtils;

    const
       ANY_SIZE = 1;
       iphlpapi = 'iphlpapi.dll';
       TCP_TABLE_OWNER_PID_ALL = 5;

       MIB_TCP_STATE:
       array[1..12] of string = ('CLOSED','LISTEN','SYN-SENT ','SYN-RECEIVED','ESTABLISHED','FIN-WAIT-1','FIN-WAIT-2','CLOSE-WAIT','CLOSING','LAST-ACK','TIME-WAIT','delete TCB');

    type
       TCP_TABLE_CLASS = Integer;

      PMibTcpRowOwnerPid = ^TMibTcpRowOwnerPid;
      TMibTcpRowOwnerPid  = packed record
        dwState     : DWORD;
        dwLocalAddr : DWORD;
        dwLocalPort : DWORD;
        dwRemoteAddr: DWORD;
        dwRemotePort: DWORD;
        dwOwningPid : DWORD;
        end;


      PMIB_TCPTABLE_OWNER_PID  = ^MIB_TCPTABLE_OWNER_PID;
      MIB_TCPTABLE_OWNER_PID = packed record
       dwNumEntries: DWord;
       table: array [0..ANY_SIZE - 1] OF TMibTcpRowOwnerPid;
      end;

    var
       GetExtendedTcpTable:function  (pTcpTable: Pointer; dwSize: PDWORD; bOrder: BOOL; lAf: ULONG; TableClass: TCP_TABLE_CLASS; Reserved: ULONG): DWord; stdcall;




    function GetPathPID(PID: DWORD): string;
    var
      Handle: THandle;
    begin
      Result := '';
      Handle := OpenProcess(PROCESS_QUERY_INFORMATION or PROCESS_VM_READ,False,PID);
      if Handle <> 0 then
        try
          SetLength(Result,MAX_PATH);
            if GetModuleFileNameEx(Handle,PChar(Result),MAX_PATH) > 0 then
              SetLength(Result,StrLen(PChar(Result)))
            else
              Result := '';
        finally
          CloseHandle(Handle);
        end;
    end;


    procedure ShowCurrentTCPConnections;
    var
       Error        : DWORD;
       TableSize    : DWORD;
       i            : integer;
       IpAddress    : in_addr;
       RemoteIp     : string;
       LocalIp      : string;
       FExtendedTcpTable : PMIB_TCPTABLE_OWNER_PID;
    begin
      TableSize := 0;
      Error := GetExtendedTcpTable(nil,@TableSize,AF_INET,TCP_TABLE_OWNER_PID_ALL,0);
      if Error <> ERROR_INSUFFICIENT_BUFFER then
         Exit;

      GetMem(FExtendedTcpTable,TableSize);
      try
       if GetExtendedTcpTable(FExtendedTcpTable,TRUE,0) = NO_ERROR then
          for i := 0 to FExtendedTcpTable.dwNumEntries - 1 do
          if {(FExtendedTcpTable.Table[i].dwOwningPid=Pid) and} (FExtendedTcpTable.Table[i].dwRemoteAddr<>0) then //here you can check the particular port
          begin
             IpAddress.s_addr := FExtendedTcpTable.Table[i].dwRemoteAddr;
             RemoteIp  := string(inet_ntoa(IpAddress));
             IpAddress.s_addr := FExtendedTcpTable.Table[i].dwLocalAddr;
             LocalIp          := string(inet_ntoa(IpAddress));
             Writeln(GetPathPID(FExtendedTcpTable.Table[i].dwOwningPid));
             Writeln(Format('%-16s %-6d %-16s %-6d %s',[LocalIp,FExtendedTcpTable.Table[i].dwLocalPort,RemoteIp,FExtendedTcpTable.Table[i].dwRemotePort,MIB_TCP_STATE[FExtendedTcpTable.Table[i].dwState]]));
          end;
      finally
         FreeMem(FExtendedTcpTable);
      end;
    end;

    var
       libHandle : THandle;
    begin
      try
        ReportMemoryLeaksOnShutdown:=DebugHook<>0;
        libHandle           := LoadLibrary(iphlpapi);
        GetExtendedTcpTable := GetProcAddress(libHandle,'GetExtendedTcpTable');
        ShowCurrentTCPConnections;
      except
        on E: Exception do
          Writeln(E.ClassName,': ',E.Message);
      end;

      readln;
    end.